Abstract
The development of plastic deformation around the crack tip of known ductile polymers (polycarbonate and nylon 6) has been studied in connection with the Dugdale model of ductile yielding. It is shown that there are particular threshold stresses below which the yielding ahead of the crack tip would not be visible and that these are closely associated with the stable crack initiation. The shape of the plastic-zone shows, in general, similar characteristics to those found in the Dugdale type yielding, but the size and displacement do not compare well with the Dugdale predictions. A modified Dugdale model, where the cohesive stress varies linearly with the distance from the crack tip, is then successfully applied to the analysis of the experimental data.
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References
J. P. Berry, J. Polym. Sci., 50, 107 (1961).
G. R. Irwin, J. Appl. Mech., 29, 361 (1957).
G. P. Marshall, L. E. Culver, and J. G. Williams, Plast. Polym., Feb., 75 (1969).
J. P. Elinck, J. C. Bauwens, and G. Homes, Intern. J. Fract. Mech., 7, 277 (1971).
G. P. Marshall, L. E. Culver, and J. G. Williams, Plast. Polym., April, 95 (1970).
I. Narisawa and T. Kondo, J. Polym. Sci., Phys. Ed., 11, 223 (1973).
P. I. Vincent, Polymer, 12, 534 (1971).
R. J. Fergunson and J. G. Williams, Polymer, 14, 103 (1973).
D. S. Dugdale, J. Mech. Phys. Solids, 8, 100 (1960).
H. F. Brinson, Exp. Mech., Feb., 72 (1970).
H. Bregkvist and H. Anderson, Intern. J. Fract. Mech., 8, 139 (1972).
T. N. Goodier and F. A. Field, “Fracture of Solids,” Interscience, New York, N.Y., 1963, p 103.
R. von Mises, Nachr. Ges. Wiss. Gott., 582 (1913).
G. R. Irwin, “Handbuch der Physik,” Springer-Verlag, New York, N.Y., 1958, p 79.
P. I. Vincent, “Deformation and Fracture of High Polymers,” Plenum Press, New York, N.Y., 1973, p 287.
T. Yokobori and A. Kamei, Intern. J. Fract. Mech., 7, 367 (1971).
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Narisawa, I., Ishikawa, M. & Ogawa, H. Fracture Processes in Ductile Polymers. I. Localized Plastic Deformations of Polycarbonate and Nylon Films. Polym J 8, 181–189 (1976). https://doi.org/10.1295/polymj.8.181
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DOI: https://doi.org/10.1295/polymj.8.181
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